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Question

How many numbers lie between squares of the following numbers ?
(i) 12 and 13
(ii)25 and 26
(iii) 99 and 100

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Solution

(i) 122=144
132=169
169144=25
So, there are 251=24 numbers lying between 122 and 132

(ii) 252=625
262=676
676625=51
So, there are 511=50 numbers lying between 252 and 262

(iii) 992=9801
1002=10000
100009801=199
So, there are 1991=198 numbers lying between 992 and 1002

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